<template>
  <div class="pos">
    <div>
      <el-row>
        <el-col :span="7" class="pos-order" id="order-list">
          <el-tabs>
            <el-tab-pane label="点餐">
              <el-table :data="tableData" border  style="width:100%">
                <el-table-column prop="goodsName" label="商品"></el-table-column>
                <el-table-column prop="count" label="量" width="50"></el-table-column>
                <el-table-column prop="price" label="金额" width="70"></el-table-column>
                <el-table-column label="操作" width="100" fixed="right">
                  <template slot-scope="scope">
                    <el-button type="text" size="small" @click="delSinglGoods(scope.row)">删除</el-button>
                    <el-button type="text" size="small" @click="addOrderList(scope.row)">增加</el-button>
                  </template>
                </el-table-column>
              </el-table>
              <div class="div-total">
                <small>数量：</small>{{totalCount}} &nbsp;&nbsp;&nbsp;&nbsp;<small>金额：</small>{{totalMoney}}元
              </div>
              <div class="div-btn">
                <el-button type="warning">挂单</el-button>
                <el-button type="danger" @click="delAllGoods()">删除</el-button>
                <el-button type="success" @click="checkout()">结账</el-button>
              </div>
            </el-tab-pane>
            <el-tab-pane label="挂单">
              挂单
            </el-tab-pane>
            <el-tab-pane label="外卖">
              外卖
            </el-tab-pane>
          </el-tabs>
        </el-col>
        <el-col :span="17">
          <div class="often-goods">
            <div class="title">常用商品</div>
            <div class="often-goods-list">
              <ul>
                <li v-for="item in oftenGoods" :key="item.goodsId" @click="addOrderList(item)">
                  <span>{{ item.goodsName }}</span>
                  <span class="o-price">￥{{ item.price }}元</span>
                </li>
              </ul>
            </div>
          </div>
          <div class="goods-type">
            <el-tabs>
              <el-tab-pane label="汉堡">
                  <div>
                    <ul class='cookList'>
                      <li v-for="goods in type0Goods" :key="goods.goodsId" @click="addOrderList(goods)">
                        <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                        <span class="foodName">{{ goods.goodsName }}</span>
                        <span class="foodPrice">￥{{ goods.price }}元</span>
                      </li>
                    </ul>
                  </div>
              </el-tab-pane>
              <el-tab-pane label="小食">
                <ul class='cookList'>
                    <li v-for="goods in type1Goods" :key="goods.goodsId" @click="addOrderList(goods)">
                      <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                      <span class="foodName">{{ goods.goodsName }}</span>
                      <span class="foodPrice">￥{{ goods.price }}元</span>
                    </li>
                </ul>
              </el-tab-pane>
              <el-tab-pane label="饮料">
                <ul class='cookList'>
                    <li v-for="goods in type2Goods" :key="goods.goodsId" @click="addOrderList(goods)">
                      <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                      <span class="foodName">{{ goods.goodsName }}</span>
                      <span class="foodPrice">￥{{ goods.price }}元</span>
                    </li>
                </ul>
              </el-tab-pane>
              <el-tab-pane label="套餐">
                  <ul class='cookList'>
                      <li v-for="goods in type3Goods" :key="goods.goodsId" @click="addOrderList(goods)">
                        <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                        <span class="foodName">{{ goods.goodsName }}</span>
                        <span class="foodPrice">￥{{ goods.price }}元</span>
                      </li>
                  </ul>
              </el-tab-pane>
          </el-tabs>
          </div>
        </el-col>
      </el-row>
    </div>
  </div>
</template>

<script>
import axios from "axios";
export default {
  name: "Pos",
  data() {
    return {
      totalCount: 0,
      totalMoney: 0,
      tableData: [],
      oftenGoods: [],
      type0Goods: [],
      type1Goods: [],
      type2Goods: [],
      type3Goods: []
    };
  },
  methods: {
    //添加商品
    addOrderList(goods) {
      let isHave = false;
      for (let i = 0; i < this.tableData.length; i++) {
        if (this.tableData[i].goodsId == goods.goodsId) {
          isHave = true;
        }
      }
      if (isHave) {
        let arr = this.tableData.filter(o => o.goodsId == goods.goodsId);
        arr[0].count++;
      } else {
        let newGoods = {
          goodsId: goods.goodsId,
          goodsName: goods.goodsName,
          price: goods.price,
          count: 1
        };
        this.tableData.push(newGoods);
      }
      this.sumGoodsMoney();
    },
    //删除单个商品
    delSinglGoods(goods) {
      this.tableData = this.tableData.filter(o => o.goodsId != goods.goodsId);
      this.sumGoodsMoney();
    },
    //删除所有商品
    delAllGoods() {
      this.tableData = [];
      this.totalCount = 0;
      this.totalMoney = 0;
    },
    //计算数量 金额
    sumGoodsMoney() {
      this.totalCount = 0;
      this.totalMoney = 0;
      this.tableData.forEach(element => {
        this.totalCount += element.count;
        this.totalMoney = this.totalMoney + element.price * element.count;
      });
    },
    //结账
    checkout() {
      if (this.totalCount != 0) {
        this.tableData = [];
        this.totalCount = 0;
        this.totalMoney = 0;
        this.$message({
          message: "结账成功",
          type: "success"
        });
      } else {
        this.$message.error("不能空结");
      }
    }
  },
  mounted: function() {
    var orderHeight = document.body.clientHeight;
    document.getElementById("order-list").style.height = orderHeight + "px";
  },
  created() {
    axios
      .get("http://jspang.com/DemoApi/oftenGoods.php")
      .then(response => {
        console.log(response.data);
        this.oftenGoods = response.data;
      })
      .catch(error => {
        console.log(error);
        alert("网络错误，不能访问");
      });
    axios
      .get("http://jspang.com/DemoApi/typeGoods.php")
      .then(response => {
        console.log(response.data);
        this.type0Goods = response.data[0];
        this.type1Goods = response.data[1];
        this.type2Goods = response.data[2];
        this.type3Goods = response.data[3];
      })
      .catch(error => {
        console.log(error);
        alert("网络错误，不能访问");
      });
  }
};
</script>

<style scoped>
.pos-order {
  background-color: #f9fafc;
  border-right: 1px solid #c0ccda;
}
.div-btn {
  margin-top: 10px;
}
.title {
  height: 20px;
  border-bottom: 1px solid #d3dce6;
  background-color: #f9fafc;
  padding: 10px;
  text-align: left;
}
.often-goods-list ul li {
  list-style: none;
  float: left;
  border: 1px solid #e5e9f2;
  padding: 10px;
  margin: 5px;
  background-color: #fff;
}
.o-price {
  color: #58b7ff;
}
.goods-type {
  clear: both;
}
.cookList li {
  list-style: none;
  width: 23%;
  border: 1px solid #e5e9f2;
  height: auot;
  overflow: hidden;
  background-color: #fff;
  padding: 2px;
  float: left;
  margin: 2px;
}
.cookList li span {
  display: block;
  float: left;
}
.foodImg {
  width: 40%;
}
.foodName {
  font-size: 18px;
  padding-left: 10px;
  color: brown;
}
.foodPrice {
  font-size: 16px;
  padding-left: 10px;
  padding-top: 10px;
}
.div-total {
  background-color: #fff;
  height: 33px;
  line-height: 33px;
  border-bottom: 1px solid #c0ccda;
}
</style>
